file: mp3 audio data detection by syncword, play: remote -t option as file now works for mp3 streams

rc/bin/play

@@ -22,9 +22,9 @@ fn sigexit {
 
 fn play1 {
 	if(~ $#* 0){
-		tmp=/tmp/play.$pid.tmp
-		dd -bs 64 -count 1 >$tmp >[2]/dev/null
-		cat $tmp /fd/0 | play1 `{file -m $tmp} xxx
+		tmp=(/tmp/play.$pid.$#tmp.tmp $tmp)
+		dd -bs 1024 -count 1 >$tmp(1) >[2]/dev/null
+		cat $tmp(1) /fd/0 | play1 `{file -m $tmp(1)} xxx
 		cleanup
 	}
 	if not {
@@ -32,16 +32,12 @@ fn play1 {
 		case *plain*
 			sed 's/
//g' | while(j=`{read}){
 				echo $"j >[1=2]
-				t=$typ
 				if(~ $"j http:* https:* HTTP:* HTTPS:*){
-					if(~ $#t 0) t=mp3
-					hget -r 'Icy-MetaData: 0' $j | play1 $t
+					hget -r 'Icy-MetaData: 0' $j | play1
 				}
 				if not {
-					if(test -r $"j){
-						if(~ $#t 0 && ~ $"j *mp3*) t=mp3
-						play1 $t <$"j
-					}
+					if(test -r $"j)
+						play1 <$"j
 					if not {
 						echo $argv0: 'can''t open file:' $"j >[1=2]
 					}
@@ -62,15 +58,12 @@ fn play1 {
 }
 
 fn usage {
-	echo usage: $argv0 [ -t type ] [-o file ] [ file ... ] >[1=2]
+	echo usage: $argv0 [ -o file ] [ file ... ] >[1=2]
 	exit usage
 }
 
 while(~ $1 -*){
 	switch($1){
-	case -t
-		typ=$2
-		shift
 	case -o
 		out=$2
 		shift
@@ -81,6 +74,6 @@ while(~ $1 -*){
 }
 
 >$out {
-	if(~ $#* 0){play1 $typ; exit}
+	if(~ $#* 0){play1; exit}
 	for(i){echo $i} | play1 plain 
 } 

sys/man/1/play

@@ -6,9 +6,6 @@ play \- simple audio player
 [
 .B -o
 .I file
-] [
-.B -t
-.I type
 ] [ 
 .I file 
 \&| 
@@ -24,30 +21,11 @@ If no
 or
 .I url
 arguments are given, standard input is used.
-Wihout the
-.B -t
-option, the file type is determined using
+The file type is determined using
 .IR file (1)
-command and the appropriate decoder is invoked.
-.PP
-Supported
-.I type
-values are:
-.TP
-.B plain
-Plain text with one file or url per line.
-.TP
-.B pls
-Winamp playlist file.
-.TP
-.B mp3
-Mpeg audio.
-.TP
-.B ogg
-Ogg vorbis.
-.TP
-.B flac
-FLAC lossless audio.
+command and a matching
+.IR audio (1)
+decoder is applied.
 .PP
 By default, raw audio data is written to
 .B /dev/audio

sys/src/cmd/file.c

@@ -150,6 +150,7 @@ int	ishtml(void);
 int	isrfc822(void);
 int	ismbox(void);
 int	islimbo(void);
+int	ismp3(void);
 int	ismung(void);
 int	isp9bit(void);
 int	isp9font(void);
@@ -195,6 +196,7 @@ int	(*call[])(void) =
 	ismsdos,	/* msdos exe (virus file attachement) */
 	isicocur,		/* windows icon or cursor file */
 	isface,		/* ascii face file */
+	ismp3,
 
 	/* last resorts */
 	ismung,		/* entropy compressed/encrypted */
@@ -1135,6 +1137,23 @@ isas(void)
 	return 1;
 }
 
+int
+ismp3(void)
+{
+	uchar *p, *e;
+
+	p = buf;
+	e = p + nbuf-1;
+	while((p < e) && (p = memchr(p, 0xFF, e - p))){
+		if((p[1] & 0xFE) == 0xFA){
+			print(mime ? "audio/mpeg\n" : "mp3 audio\n");
+			return 1;
+		}
+		p++;
+	}
+	return 0;
+}
+
 /*
  * low entropy means encrypted
  */